晋中至太原城际铁路沿线地质条件分析

Discussion on the Geological Condition along the Jinzhogn to Taiyuan Intercity Railway

晋中至太原城际铁路位于山西断陷带次级构造单元太原断陷盆地内,盆地内部新构造运动复杂,城际铁路沿线跨越多条第四纪隐伏活动断裂,并穿过榆次地裂缝发育地带及砂土液化区域,这些地质问题极大地影响着晋中至太原城际铁路的前期勘测选线。本文从地质构造、地层岩性、浅层地震勘探等方面对穿越城际铁路的三条活动断裂的危险性进行了分析评价,以查明断裂错动对城际铁路的影响。结合前人对榆次地裂缝的研究成果,对城际铁路附近的地裂缝发育情况进行了调查验证,以查明榆次地裂缝对城际铁路的影响。通过在城际铁路车站及车辆段布置地质钻孔,进行标贯试验、剪切波速测试,以查明城际铁路沿线工程地质条件,对沿线车站及车辆段场地进行液化判定及场地类别判定。针对城际铁路沿线存在的上述地质问题,给出了相应的工程建议,对城际铁路前期勘测设计具有重要的指导意义。

Jinzhong to Taiyuan intercity railway is located in the Taiyuan fault basin, which geological conditions are complex. This railway is across multiple Quaternary buried active faults and through the ground fissures in Yuci Development Zone and sand liquefaction area. These geological problems greatly affect the preliminary survey line selection of Jinzhong to Taiyuan intercity railway. In order to find out the fault influence on the railway, in this paper, the geological conditions along the intercity railway are studied, for example, the geological structure,stratum, lithology, shallow seismic exploration in three aspects of the active fault crossing the intercity railway.In combination with the previous research results of the ground fissures in Yuci, the development of the ground fissures in the vicinity of the intercity railway was investigated and verified, in order to find out the influence of Yuci ground fissures along the intercity railway. Through geological drilling, standard penetration testing and shear wave velocity testing, we identify the intercity railway engineering geological conditions and along the station for liquefaction judging and distinguishing site types. According to the above geological problems existing in the intercity railway, the corresponding engineering suggestions are given, which are important guiding significance to the preliminary survey and design.